Pose a problem that requires a system of linear inequalities for its solution. Make an illustration or drawing of your problem as part of visualization of the situation. You may enhance your output by adding colors. Use a realistic context or situation. Show the complete solutions of your problem by following Polya's steps in problem solving

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reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.